The Lenape High School Indians compete in the
Olympic Conference, which is comprised of public and private high schools in Burlington and
Camden counties and operates under the supervision of the
New Jersey State Interscholastic Athletic Association (NJSIAA). With 1,437 students in grades 10-12, the school was classified by the NJSIAA for the 2019–20 school year as Group IV South for most athletic competition purposes, which included schools with an enrollment of 1,060 to 5,049 students in that grade range. The football team competes in the American Division of the 94-team
West Jersey Football League superconference and was classified by the NJSIAA as Group V South for football for 2024–2026, which included schools with 1,333 to 2,324 students. Lenape High School also has a separate club
ultimate and ice hockey teams. The ice hockey team is member of the South Jersey High School Ice Hockey League. The softball team won the South II state sectional title in 1972, the South sectional title in 1973-1975, was overall state champion in 1974 (defeating
Westfield High School in the finals) and won the Group IV state title in 1981 (vs.
Eastside High School). The 1981 team finished the season with a 21-2 record after winning the Group IV state title with a 5-4 one-hitter against Eastside in the championship game. The 1974 team finished the season 15-1 after winning the overall state championship against runner-up Westfield. The girls bowling team was overall state champion in 1980 (as co-champion with
South Plainfield High School) and 1982. The 1980 team was tied for first place with 2,424 pins with South Plainfield. The 1982 team won the state title outright with a total of 2,590 pins, 44 ahead of
Toms River High School North in second place. The girls' lacrosse team won the overall state championship in 1981 (defeating
Collingswood High School in the tournament final), and won the Group IV title in both 2007 (vs.
Montclair High School) and 2014 (vs.
Ridge High School); the program's three grouptitles are tied for tenth in the state. The team won the 2007 Group IV state championship with an 11–7 win against Montclair in the championship game. The boys' wrestling team won the South Jersey Group IV state sectional championship in 1986, 1987 and 1989. The girls' gymnastics team has won the team state championship in 1987, 1988 and 1990; the three titles are the most of any public school in the state. The boys' soccer team won the Group IV state championship in 1996, against
Randolph High School in the finals of the tournament. The boys' track team won the indoor relay state championship in Group IV in 1998 (as co-champion).The girls team won the Group IV title in 2008, 2011 and 2012. The team won the Group IV indoor track state championship in 1999 (as co-champion) and 2000. The girls team won the Group IV state title in 2008. The field hockey team won the Central Jersey Group IV state championship in 2000, 2003, 2017 and 2019. Lenape won the 2003 Central Jersey Group IV sectional championship in field hockey, edging
Cherokee High School 2–1 in the tournament final. The boys' track team won the Group IV spring / outdoor track state championship in 2000. The boys' basketball team won the Group IV state championship in 2004 (defeating runner-up
Plainfield High School in the final game of the tournament) and 2009 (vs.
Paterson Eastside) The 2004 boys' basketball won the South Jersey, Group IV championship, defeating
Atlantic City High School 66–51. The team moved on to win the 2004 Group IV state championship with a 63-46 win over Plainfield High School. The 2009 boys' basketball team won the NJSIAA South Group IV title and went on to win the program's second Group IV state championship by defeating Eastside High School (of Paterson) by a score of 68–48 at
Rutgers University. The girls' soccer team won the Group IV state championship in 2007 (defeating
Bridgewater-Raritan High School in the finals of the tournament), 2008 (vs.
Ridge High School), 2009 (vs.
Westfield High School), 2020 (vs.
Livingston High School) and 2011 (vs. Ridge). The program's five state titles are tied for tenth-most in the state and the five consecutive titles are the second-longest streak. The girls' soccer team won the South Jersey Group IV title in 2004 with a 3–1 win over
Washington Township High School. In 2007, the team won the South, Group IV state sectional championship with a 3–2 win over
Toms River High School North in the tournament final. The team moved on to win the 2007 Group IV state championship with a 3–0 win over Bridgewater-Raritan in the playoff finals at
The College of New Jersey to finish the season with a 22-2-1 record. Lenape girls soccer team won the 2008–09 state championship against Ridge High School, 1–0 to top off a perfect season at 25–0–0. The team won their third consecutive state championship with a 1–0 win over Westfield High School in the 2009–10 season. The team won their fourth consecutive state championship in the 2010–11 season, the first Group IV team to achieve this accomplishment, with a 5-2 win over Livingston High School. Lenape girls soccer is led by Coaches Kevin Meder and Tony Guerrara. The 2008 Lenape boys' bowling squad featured one of the best individual seasons in high school bowling history. Class of 2011 member Anthony Scerati averaged 235.67 during the season, which included a perfect 300 game, and an 803 series. He also took the singles title at the Holiday tournament, firing a 772 series. The girls' spring track team was the Group IV state champion in 2015. The girls' basketball team won the Group IV state championship in 2016 (with a win against
John F. Kennedy High School (Paterson) in the finals of the tournament) and 2024 (vs.
Morristown High School). The 2016 team won the program's first state title with a 50-35 win against J.F.K High School (Paterson). The football team won the South Jersey Group V state sectional championship in 2017. In fall 1996, the Lenape football team pulled off the biggest upset in South Jersey football history by defeating
Washington Township High School, the top-ranked team in South Jersey and top five in the state, coming back from 14-2 to win 21-14. In the fall of 1997 Lenape won the Olympic Conference in football and spent most of the season ranked #1 in South Jersey. The team won its first state sectional title, defeating
Rancocas Valley Regional High School in the 2017 South Jersey Group V state sectional championship game on a field goal scored with five seconds on the clock to give top-seeded Lenape the 10-7 win over the
Rancocas Valley Regional High School, the tournament's second seed. ==Extracurricular activities==